2014.EST
Onsite-Verified Factory
≥ 99.99%
SiO2 Ultra-High Purity
1100°C
Working Temperature
≤ 4Hours
Rapid Engineering Reply
Catalog Portfolio
Precision Quartz & Infrared Thermal Heating Products
Manufactured using premium fused silica envelopes, precision tungsten filaments, and proprietary reflective coatings to satisfy strict mechanical and thermal specifications.
Technical Whitepaper
Engineering Superiority: Fused Quartz Glass Rods & Silica Profiles
Synthetic and natural fused silica glass rods represent the pinnacle of high-purity amorphous silicon dioxide (SiO2) engineering. Sourced from the globally renowned quartz hub in Lianyungang, China, our vitreous silica rods exhibit near-zero thermal expansion coefficients (5.5 × 10-7 /K), empowering them to withstand instantaneous thermal shock transitions exceeding 1000°C without structural crazing or micro-fracture propagation.
Through electric vacuum fusion and hydrogen-oxygen flame continuous drawing processes, the raw quartz crystals are refined to remove internal hydroxyl radical groups (OH- content suppressed below 20 ppm or elevated for dedicated spectroscopic requirements). This achieves uniform broadband light transmission spanning deep ultraviolet (185 nm) down through visible optics and near-to-mid infrared radiation bands (up to 3.5 µm), setting the benchmark for precision optical light guides, semiconductor wafer transport jigs, high-temperature furnace sight glasses, and quartz infrared heating envelopes.
Our OEM/ODM capabilities encompass solid round rods, precision capillary quartz tubes, slotted profile rods, and laser-polished terminal endfaces with ultra-tight geometric tolerances down to ±0.02 mm.
| Physical / Thermal Parameter | Standard Engineering Metric |
|---|---|
| Silica Purity (SiO2) | 99.99% – 99.999% (Semiconductor Grade) |
| Density (20°C) | 2.20 × 103 kg/m3 |
| Coefficient of Thermal Expansion | 5.5 × 10-7 cm/cm °C (20°C to 320°C) |
| Continuous Working Temperature | 1100°C (1373 K) |
| Short-Term Max Strain Point | 1450°C (1723 K) |
| Refractive Index (nD 589.3 nm) | 1.4585 |
| Dielectric Strength (20°C) | 25 – 40 kV/mm |
Manufacturing Excellence
Why International OEMs Depend on Kavri Quartz
Combining primary regional raw mineral advantages in Donghai with decade-long precision glass-blowing craft, automated sealing systems, and direct export operations.
Lianyungang Cluster Hub
Situated in the heart of Niushan Street, Lianyungang, our supply chain direct-sources ultra-high purity silica sands, yielding unmatched raw material cost-effectiveness and rapid ingot production scaling.
Bespoke OEM/ODM Customization
Over 10 years of bespoke manufacturing experience. We engineer to specific technical drawings, CAD files, or physical machine samples, accommodating custom rod diameters (1mm to 120mm), special caps, leads, and coatings.
Rigorous In-House Metrology
Our 3 dedicated continuous lines conduct strict multi-stage inspection: polariscope residual stress profiling, spectrophotometer transmission verification, and laser caliper dimensional screening before packing.
Global Tier-1 Logistics
Exporting 81%–90% of overall production across Germany, Netherlands, USA, Japan, and Korea. Custom reinforced shock-absorbing wooden packaging ensures zero-breakage delivery under FOB, CFR, CIF, or DDP terms.
Procurement Outlook
Emerging Technology Trends in Fused Quartz Glass Applications
Strategic insights for procurement directors, equipment engineers, and supply chain managers navigating next-generation vitreous material demands.
Semiconductor & Cleanroom
Transition to Sub-PPM Trace Metals
With node shrinking in 3nm/2nm lithography and advanced dry etching systems, fab procurement teams are moving away from standard commercial-grade quartz. Demand is pivoting towards synthetic vitreous silica rods with trace alkali metals (Li, Na, K) suppressed below 0.1 ppm to prevent thermal furnace devitrification and catastrophic wafer cross-contamination.
Photovoltaics & E-Mobility
High-Throughput Short-Wave Emitters
TOPCon and Perovskite solar cell metallization sintering alongside EV battery electrode drying lines demand extreme heat ramp speeds. Twin-tube halogen heaters and precision polished quartz rods with directional gold/half-white reflective coatings are replacing traditional convective ovens, achieving 40% higher energy-to-heat transfer efficiencies.
Circular Supply Chain
Standardized Rapid-Interchange Assemblies
Global maintenance and repair operations (MRO) are standardizing terminal geometries and connection clips (such as 13195X clip configurations) to simplify line retrofits. Direct OEM contract partnering is surging over third-party distributor sourcing to cut middleman margins and safeguard tight replacement delivery timelines.
Knowledge Base
Frequently Asked Questions by Industrial Buyers
Comprehensive engineering clarifications addressing quartz rod production tolerances, MOQ criteria, optical coatings, and custom export workflows.
What are the key differences between transparent quartz rods and opaque/translucent quartz profiles?
Transparent fused quartz rods are processed to eliminate internal gaseous bubble voids, achieving superior optical clarity across UV, visible, and infrared spectra, alongside maximum tensile fracture resistance. Opaque or milky translucent quartz contains microscopic gaseous bubbles that diffuse light and enhance thermal insulation, making them economical choices for furnace baffles, thermal shielding blocks, and resistance wire supports where direct optical transmission is not required.
What dimensional tolerances and finishing services can your Lianyungang facility achieve?
Our continuous drawing and CNC cold-working workshops accommodate outer diameters from 1.0 mm up to 120 mm with standard tolerances of ±0.1 mm, and high-precision ground tolerances down to ±0.02 mm. Secondary operations include mechanical polishing, optical flame-polishing, ultrasonic drilling, chamfering, flat endface optical cutting, beveling, and slot grinding according to custom technical blueprints.
How does Kavri Quartz ensure fragile quartz products survive international sea and air transit?
Export packaging uses a multi-tier protective cushioning matrix. Each quartz rod or lamp envelope is wrapped in electrostatic protective film, encased in high-density customized pearl cotton (EPE) grooved trays, surrounded by shock-absorbing honeycomb buffering, and packaged within reinforced export-grade plywood crates. With more than a decade of export operations across Europe and the Americas, our transit damage rate remains below 0.15%.
What is your Minimum Order Quantity (MOQ) and production turnaround for custom prototypes?
For standard dimensional quartz glass rods and typical industrial infrared heating lamps, our MOQ is as flexible as 8 to 10 units to support engineering trials, line prototyping, or emergency MRO replacements. Prototyping lead times for custom drawings usually require 5 to 7 working days, with mass batch orders completed within 15 to 20 working days.
Can you apply directional reflective coatings directly to quartz envelopes and rods?
Yes. We offer high-efficiency directional coatings including 180-degree or custom-angle vacuum-sputtered pure gold reflectors (reflecting up to 95% of infrared energy forward) and oven-bonded ceramic half-white coatings that withstand continuous ambient operating temperatures above 800°C without peeling or discoloration.
Require Custom Engineered Quartz Glass Rods or IR Heaters?
Connect with our senior technical engineering team in Lianyungang for tolerance consultations, drawing appraisals, sample fabrications, and tier-1 factory direct export quotations.